Martinez-Calderon, C., Oonishi, T., Shiokawa, K. et al. Characteristics and longitudinal extent of VLF quasi-periodic emissions using multi-point ground-based observations. Earth Planets Space 75, 148 (2023). https://doi.org/10.1186/s40623-023-01898-1
Characteristics and longitudinal extent of VLF quasi-periodic emissions using multi-point ground-based observations
|Author:||Martinez-Calderon, Claudia1; Oonishi, Tomoka1; Shiokawa, Kazuo1;|
1Institute for Space-Earth Environmental Research, Nagoya, Japan
2Sodankylä Geophysical Observatory, Sodankylä, Finland
3ISTP, Russian Academy of Sciences, Irkutsk, Russia
4Kanazawa University, Kanazawa, Japan
|Online Access:||PDF Full Text (PDF, 8.4 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe20231018140541
|Publish Date:|| 2023-10-18
Quasi-periodic (QP) emissions are a type of magnetospheric ELF/VLF waves characterized by a periodic intensity modulation ranging from tens of seconds to several minutes. Here, we present 63 QP events observed between January 2017 and December 2018. Initially detected at the VLF receiver in Kannuslehto, Finland (KAN, MLAT = 67.7°N, L = 5.5), we proceeded to check whether these events were simultaneously observed at other subauroral receivers. To do so we used the following PWING stations: Athabasca (ATH, MLAT = 61.2°N, L = 4.3, Canada), Gakona (GAK, MLAT = 63.6°N, L = 4.9, Alaska), Husafell (HUS, MLAT = 64.9°N, L = 5.6, Iceland), Istok (IST, MLAT = 60.6°N, L = 6.0, Russia), Kapuskasing (KAP, MLAT = 58.7°N, L = 3.8, Canada), Maimaga (MAM, MLAT = 58.0°N, L = 3.6, Russia), and Nain (NAI, MLAT = 65.8°N, L = 5.0, Canada). We found that: (1) QP emissions detected at KAN had a relatively longer observation time (1–10 h) than other stations, (2) 11.3% of the emissions at KAN were observed showing one-to-one correspondence at IST, and (3) no station other than IST simultaneously observed the same QP emission as KAN. Since KAN and IST are longitudinally separated by 60.6°, we estimate that the maximum meridional spread of conjugated QP emissions should be close to 60° or 4 MLT. Comparison with geomagnetic data shows half of the events are categorized as type II, while the rest are mixed (type I and II). This study is the first to clarify the longitudinal spread of QP waves observed on the ground by analyzing simultaneous observations over 2 years using multiple ground stations.
Earth, planets and space
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
115 Astronomy and space science
The research and data analysis made by CMC is funded by Nagoya University and several Grant-in-Aid for Scientific Research from Japan Society for the Promotion of Science (JSPS 16H06286 (PWING project), 21H04518, 21H04518, 22K21345 (PBASE program)).
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